Example of scenario for jupyter/declarativewidgets#125

Issue125.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "from IPython.display import HTML, Javascript, display"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "This is the first function. In this function we are using `display` to send javascript code that will call the `invoke` method of another `urth-core-function` element."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "#First function\n",
    "def function1(name):\n",
    "    display(HTML(\"<script>console.log('Invoking from kernel'); f2.invoke();</script>\"))\n",
    "    return 'Hello ' + name"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "%%html\n",
    "<template is=\"urth-core-bind\">\n",
    "    <urth-core-function id=\"f1\" ref=\"function1\" arg-name=\"{{the_name}}\" result=\"{{hello}}\" auto/>\n",
    "    the_name: <input type=\"text\" value=\"{{the_name::input}}\"></input>\n",
    "    <span>{{hello}}</span>\n",
    "</template>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def function2(name):\n",
    "    return 'Goodbye ' + name"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "%%html\n",
    "<template is=\"urth-core-bind\">\n",
    "    <urth-core-function id=\"f2\" ref=\"function2\" arg-name=\"{{the_name}}\" result=\"{{goodbye}}\"/>\n",
    "    <span>{{goodbye}}</span>\n",
    "</template>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### STOP Exetuting cells\n",
    "Notice that entering data on the form above is **NOT** causing the 2nd function to get called. The `<urth-core-function id=\"f2\">` does not have `auto` set on purpose."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "To prove that it might be the way we are invoking the python function when calling it through the `urth-core-function` element, calling the `function1` directly or evaluating a cell with `display` will actually cause `function2` to get called. **Remember to change the text on the input filed above** "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "display(HTML(\"<script>console.log('Invoking from kernel'); f2.invoke();</script>\"))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "function1('some name')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.4.3"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 0
}